这是编译原理里面用来判断输入的东西是是否是符合数学运算公式...

一个识别c语言关键字和大小写转换的程序-an identification and case-insensitive language keyword conversion process

一个简单的C词法分析器 能识别数字,标志符(关键字,变量)和一些运算符.-a simple C lexical analyzer can identify the number, identifier (keyword, variable), and some Operators.

从网上下载lex工具源代码，并对其进行反复修改 使其能按我们的要求对C程序进行词法分析，然后输出我们期望的结果 -downloaded from the Internet tools lex source code, and it has repeatedly revised to enable it to us by the requirements of the C procedures lexical analysis, and then output the results we expect

LDPC码在AWGN信道下的MATLAB仿真程序-LDPC code in AWGN channel under the MATLAB simulation program

一个简单的词法分析器，1代表字符，2代表关键字（命令字），4带表算符界符， 注：要把wangs.txt这个文件放在桌面上，然后在这个TXT里写上你要识别的语句。然后保存后关毕，在运行WANG词法分析.EXE进行词法分析。 完成识别后，会在相应的词面前出现以上代号。暂不能对数字进行识别。因为在某种请况下数字也可表是为字符……稍有困难，但完成老师的针对程序段：area=b+c*d。那简直是小菜一碟。-a simple lexical analyzer, a representative character, the two representatives keyword (command word), with four tables operator sector website Note : The wangs.txt the document on the desktop, then the TXT Lane write you to identify words. Then preserved customs Albert, running WANG lexical analysis. EXE for lexical analysis. After completing the identification, in the appropriate words appear in front of the above code. Provisional figures for the right not to identify. Because of the status of requests under certain figures might be for the characters ... the slightest difficulty, but the completion of procedural teachers : area = b, c* d. It is simply to touch.

一个用C语言写的词法分析程序，输入所给文法的源程序字符串，输出二元组构成的序列。附有实验报告-Using C language to write a lexical analysis program, enter the source string to the grammar, the output sequence of binary units. With the experimental report

这是一个此法分析器的手工构造实例，程序很简洁。-This is a method of manual analyzer tectonic example, a very simple procedure.

编译原理---正则表达式到DFA的演示程序- Translation principle--- regular expression to DFA demonstration program

编译原理词法分析的一个小代码-compiler theory lexical analysis of a small code

用递归下降法分析算术表达式的框图，主要完成： ⑴ 通知外界键入算术表达式； ⑵ 控制Ｅ过程分析算术表达式； ⑶ 根据分析结果之正误，分别通知外界不同的信息。 -Analysis of recursive descent method with arithmetic expressions diagram, mainly to complete: ⑴ notice outside type arithmetic expressions ⑵ control process analysis arithmetic expression E ⑶ results are based on an analysis of error, respectively, different information to inform the outside world.